We help IT Professionals succeed at work.
Get Started

#5.7.1 smtp;550 5.7.1 Unable to relay

charles18602 asked
Last Modified: 2012-05-05
I am getting the following error even though the user is using outlook on a MAPI client and is using a computer and user account on the domain.  It is a Windows 2003 SBS server with SP2 and Exchange SP2
Box is checked on SMTP connector to allow all users who successfully authenticate to relay
Watch Question
Principal Consultant
Most Valuable Expert 2016
Top Expert 2014
This problem has been solved!
Unlock 1 Answer and 4 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE